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Title: Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys

Abstract

Sub-picosecond magnetisation manipulation via femtosecond optical pumping has attracted wide attention ever since its original discovery in 1996. Furthermore, the spatial evolution of the magnetisation is not yet well understood, in part due to the difficulty in experimentally probing such rapid dynamics. Here, we find evidence of rapid magnetic order recovery in materials with perpendicular magnetic anisotropy via nonlinear magnon processes. We identify both localisation and coalescence regimes, whereby localised magnetic textures nucleate and subsequently evolve in accordance with a power law formalism. Coalescence is observed for optical excitations both above and below the switching threshold. Simulations indicate that the ultrafast generation of noncollinear magnetisation via optical pumping establishes exchange-mediated spin currents with an equivalent 100% spin polarised charge current density of 108 A/cm2. Such large spin currents precipitate rapid recovery of magnetic order after optical pumping. These processes suggest an ultrafast optical route for the stabilization of desired meta-stable states, e.g., isolated skyrmions.

Authors:
 [1];  [2];  [2];  [3];  [4];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [5];  [2];  [2];  [2];  [2];  [2] more »;  [2];  [2];  [6];  [7];  [7];  [7];  [7];  [2];  [4];  [8];  [4];  [9];  [10];  [11] « less
  1. Univ. of Colorado, Boulder, CO (United States); National Inst. of Standards and Technology (NIST), Boulder, CO (United States); Chalmers Univ. of Technology, Gothenburg (Sweden)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Tongji Univ., Shanghai (China)
  4. Univ. of York, York (United Kingdom)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States); European X-Ray Free-Electron Laser Facility GmbH, Schenefeld (Germany)
  6. Nihon Univ., Chiba (Japan)
  7. Radboud Univ., Nijmegen (The Netherlands)
  8. Univ. de Liege, Sart Tilman (Belgium); Sheffield Hallam Univ., Sheffield (United Kingdom)
  9. Univ. of Colorado, Boulder, CO (United States)
  10. National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  11. SLAC National Accelerator Lab., Menlo Park, CA (United States); Uppsala Univ., Uppsala (Sweden)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1505610
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Iacocca, E., Liu, T. -M., Reid, A. H., Fu, Z., Ruta, S., Granitzka, P. W., Jal, E., Bonetti, S., Gray, A. X., Graves, C. E., Kukreja, R., Chen, Z., Higley, D. J., Chase, T., LeGuyader, L., Hirsch, K., Ohldag, H., Schlotter, W. F., Dakovski, G. L., Coslovich, G., Hoffmann, M. C., Carron, S., Tsukamoto, A., Savoini, M., Kirilyuk, A., Kimel, A. V., Rasing, Th., Stohr, J., Evans, R. F. L., Ostler, T., Cantrell, R. W., Hoefer, M. A., Silva, T. J., and Durr, Herman A. Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys. United States: N. p., 2019. Web. doi:10.1038/s41467-019-09577-0.
Iacocca, E., Liu, T. -M., Reid, A. H., Fu, Z., Ruta, S., Granitzka, P. W., Jal, E., Bonetti, S., Gray, A. X., Graves, C. E., Kukreja, R., Chen, Z., Higley, D. J., Chase, T., LeGuyader, L., Hirsch, K., Ohldag, H., Schlotter, W. F., Dakovski, G. L., Coslovich, G., Hoffmann, M. C., Carron, S., Tsukamoto, A., Savoini, M., Kirilyuk, A., Kimel, A. V., Rasing, Th., Stohr, J., Evans, R. F. L., Ostler, T., Cantrell, R. W., Hoefer, M. A., Silva, T. J., & Durr, Herman A. Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys. United States. doi:10.1038/s41467-019-09577-0.
Iacocca, E., Liu, T. -M., Reid, A. H., Fu, Z., Ruta, S., Granitzka, P. W., Jal, E., Bonetti, S., Gray, A. X., Graves, C. E., Kukreja, R., Chen, Z., Higley, D. J., Chase, T., LeGuyader, L., Hirsch, K., Ohldag, H., Schlotter, W. F., Dakovski, G. L., Coslovich, G., Hoffmann, M. C., Carron, S., Tsukamoto, A., Savoini, M., Kirilyuk, A., Kimel, A. V., Rasing, Th., Stohr, J., Evans, R. F. L., Ostler, T., Cantrell, R. W., Hoefer, M. A., Silva, T. J., and Durr, Herman A. Mon . "Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys". United States. doi:10.1038/s41467-019-09577-0. https://www.osti.gov/servlets/purl/1505610.
@article{osti_1505610,
title = {Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys},
author = {Iacocca, E. and Liu, T. -M. and Reid, A. H. and Fu, Z. and Ruta, S. and Granitzka, P. W. and Jal, E. and Bonetti, S. and Gray, A. X. and Graves, C. E. and Kukreja, R. and Chen, Z. and Higley, D. J. and Chase, T. and LeGuyader, L. and Hirsch, K. and Ohldag, H. and Schlotter, W. F. and Dakovski, G. L. and Coslovich, G. and Hoffmann, M. C. and Carron, S. and Tsukamoto, A. and Savoini, M. and Kirilyuk, A. and Kimel, A. V. and Rasing, Th. and Stohr, J. and Evans, R. F. L. and Ostler, T. and Cantrell, R. W. and Hoefer, M. A. and Silva, T. J. and Durr, Herman A.},
abstractNote = {Sub-picosecond magnetisation manipulation via femtosecond optical pumping has attracted wide attention ever since its original discovery in 1996. Furthermore, the spatial evolution of the magnetisation is not yet well understood, in part due to the difficulty in experimentally probing such rapid dynamics. Here, we find evidence of rapid magnetic order recovery in materials with perpendicular magnetic anisotropy via nonlinear magnon processes. We identify both localisation and coalescence regimes, whereby localised magnetic textures nucleate and subsequently evolve in accordance with a power law formalism. Coalescence is observed for optical excitations both above and below the switching threshold. Simulations indicate that the ultrafast generation of noncollinear magnetisation via optical pumping establishes exchange-mediated spin currents with an equivalent 100% spin polarised charge current density of 108 A/cm2. Such large spin currents precipitate rapid recovery of magnetic order after optical pumping. These processes suggest an ultrafast optical route for the stabilization of desired meta-stable states, e.g., isolated skyrmions.},
doi = {10.1038/s41467-019-09577-0},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United States},
year = {2019},
month = {4}
}

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